Brown ring test s performed for which ion?

Options

A. `NO_2^-`
B. `NO_3^-`
C. `HO^-`
D. `H_2N^-`

Answer

**Step-by-Step Solution:**

1. **Understanding the Brown Ring Test:**
The Brown Ring Test is a qualitative analysis test used to detect the presence of certain ions in a solution.

2. **Identifying the Ion:**
The specific ion that the Brown Ring Test is used to detect is the nitrate ion (NO₃⁻).

3. **Chemical Reaction Involved:**
In the Brown Ring Test, a solution containing nitrate ions is treated with iron(II) sulfate (FeSO₄) and concentrated sulfuric acid (H₂SO₄). The reaction leads to the formation of a brown ring complex, which indicates the presence of nitrate ions.

4. **Applications of the Test:**
The Brown Ring Test can be applied in various fields to detect nitrate ions in different samples, such as food, soil, and water.

5. **Conclusion:**
Therefore, the Brown Ring Test is performed specifically for detecting the presence of the nitrate ion (NO₃⁻).

**Final Answer:**
The Brown Ring Test is performed for the nitrate ion (NO₃⁻).

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